Comments can be threaded. Now your query can be threaded too! Bonus: it's
not totally insane.
* The new `$hierarchical` parameter for `WP_Comment_Query` accepts three values:
* `false` - Default value, and equivalent to current behavior. No descendants are fetched for matched comments.
* `'flat'` - `WP_Comment_Query` will fetch the descendant tree for each comment matched by the query paramaters, and append them to the flat array of comments returned. Use this when you have a separate routine for constructing the tree - for example, when passing a list of comments to a `Walker` object.
* `'threaded'` - `WP_Comment_Query` will fetch the descendant tree for each comment, and return it in a tree structure located in the `children` property of the `WP_Comment` objects.
* `WP_Comment` now has a few utility methods for fetching the descendant tree (`get_children()`), fetching a single direct descendant comment (`get_child()`), and adding anothing `WP_Comment` object as a direct descendant (`add_child()`). Note that `add_child()` only modifies the comment object - it does not touch the database.
Props boonebgorges, wonderboymusic.
See #8071.
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[34537] hooked `wp_new_comment_notify_postauthor()` to the
'wp_set_comment_status' when a comment had been approved. When performing
multiple actions on a comment in the same request (as happens in
`Tests_Ajax_DeleteComment::test_ajax_trash_double_action()`, and may happen
sometimes in real life too), and when one of those actions involves deleting
the comment, the `$comment_ID` passed to `wp_new_comment_notify_postauthor()`
can correspond to an already-deleted comment. The `comment_status` check should
account for this possibility.
See #14078.
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`WP_Comment_Query` will now report the total number of comments matching the
query params (`comments_found`), as well as the total number of pages required
to display these comments (`max_num_pages`). Because `SQL_CALC_FOUND_ROWS`
queries can introduce a lot of overhead in some cases, we disable the feature
by default. Pass `no_found_rows=false` to `WP_Comment_Query` to enable the
count. (We use the negative parameter name 'no_found_rows' for parity with
`WP_Query`.)
Props wonderboymusic, boonebgorges.
See #8071.
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The 'last_changed' incrementor is used to invalidate the `get_terms()` query
cache. Since `get_terms()` queries may reference 'meta_query', changing term
metadata could change the results of the queries. So we invalidate the cache
on add, delete, and update.
See #10142.
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This is part of the project of #33587.
Moving this particular message to the
'wp_set_comment_status' action has the added bonus that the notification is
sent after the comment status has been updated in the database. Previously, a
database error could lead to a case where an approval notification is sent,
but the comment status change fails for some reason.
Props mrmist, NickDuncan.
Fixes#14078.
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`wp_allow_comment()` disallows a comment if it matches a comment on the same
post with the same content, author email, and parent. This new filter allows
developers to circumvent or modify this logic, making the duplicate check
more or less lenient, as they see fit.
Fixes#9775.
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The new `$comment_meta` parameter of `wp_insert_comment()` allows an array of
key/value pairs to be passed when creating a comment. These pairs are then
stored as commentmeta when the comment has been created.
Props tellyworth, wonderboymusic.
Fixes#12431.
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This is an alternative to using 'offset', and manually calculating pagination.
Note that 'paged' works only in conjunction with 'number', the latter of which
provides the per-page value.
Props sebastian.pisula.
Fixes#25145.
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Adds a new table to the database schema (`wp_termmeta`), and a set of
`*_term_meta()` API functions. `get_terms()` and `wp_get_object_terms()`
now also support 'meta_query' parameters, with syntax identical to other
uses of `WP_Meta_Query`.
When fetching terms via `get_terms()` or `wp_get_object_terms()`, metadata for
matched terms is preloaded into the cache by default. Disable this behavior
by setting the new `$update_term_meta_cache` paramater to `false`.
To maximize performance, within `WP_Query` loops, the termmeta cache is *not*
primed by default. Instead, we use a lazy-loading technique: metadata for all
terms belonging to posts in the loop is loaded into the cache the first time
that `get_term_meta()` is called within the loop.
Props boonebgorges, sirzooro.
See #10142.
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The filter explicitly expects one of three passed value types:
* An array containing 'headers', 'body', 'response', 'cookies', and 'filename' elements
* A `WP_Error` instance
* Boolean false (to avoid short-circuiting the response)
Props johnbillion.
Fixes#33995.
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